Metal-cut-off saw.



P. W; POST. METAL GUT-OFF SAW. I APPLIOATION FILED now. a1, 1906.

Patented Oct 19, 1909.

6 BHBETS-8EEET 1.

ANDREW a, mum 0o. PHOTO-LITKDGRAPHERS, WASH NGTON. D. a

P. w; 9091?. METAL GUT-OFF SAW.

APPLICATION FILED OUT. 31, L906.

Patented Oct. 19,1909.

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P. W. POST. METAL GUT-OFF SAW. urmouzon rum) 001231, 1906.

Patented Oct. 19,1909.

6 SHBETS SHEET 3.

P. W. POST. METAL GUT-OFF SAW. APPLICATION FILED 001'. 31, 1906.

. Patented Oct; 19,1909. 5 SHEETS-SHEET 4.

UNITED srn'rns PATENT onrion.

PAUL W. POST, 0F MILWAUKEE, WISCONSIN, ASSIGNOR TO SMITH AND POSTCOMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

METAL-CUT-OFF SAW.

Specification of Letters Patent.

T 0 all whom it may concern:

Be it known that I, PAUL W. Posr, of Milwaukee, in the county ofMilwaukee and State of Wisconsin, have invented a new and usefulImprovement in Metal-Cut-Ofi Saws, of which the following is aspecification.

My invention relates to improvements in metal cutofi saws, the objectsof my improvement being to provide a saw that will stand a heavy feed,that will have an automatically adjusting feed, an automatic feedthrow-out and a quick. return. I attain these objects by the variousfeatures of construction shown in the accompanying drawings, which arehereby made a part of this application, and in which i Figure l is aside elevation of the machine, showing the feeding and clamping devicesin central longitudinal section, taken on the line 11 of Fig. 2, part ofthe saw being broken away. Fig. 2 is a plan view of the entire machine.Fig. 3 is a rear elevation of the entire machine. Fig. 4 is a detailview of the yielding gear for cushioning the engagement for the quickreturn feed. Figs. 5 and 6 show the feed disconnecting device in detail.Fig. 7 is a detail view of the pawl therefor. Fig. 8 is a detail view ofthe friction connection of the feed screw. Fig. 9 is a detail view of afragment of the saw. Figs. 10 and 11 are sectional views thereof takenon the planes of sectional'lines 1010 and 11-11 of Fig. 9 respectively.

Similar letters refer to the same parts, throughout the several figures.

A is the saw and B is the pulley through which power is applied to themachine. The train of mechanism between B and A is traced as follows: Eis mounted on the shaft, 6, which also carries the pinion, 6 whichpinion meshes with the gear, 6 mounted on shaft 6 The pinion b, on shaft6 meshes with gear 6 on the shaft 7)", whose wide faced pinion, 6engages with the equally wide faced pinion b on the saw arbor a. It willbe noticed that the speed is reduced from the shaft 1) to b ,and againfrom b to b, and the face of the gears is inversely proportional totheir speed. All of these parts are carried on the movable carriage C,which travelsto and fro on the dove-tailed ways at d, on the top of theframe or column D.

The work is held between the stationary jaw, (P, which is a part of thecolumn D, and

the movable jaw, W. This latter jaw is adjusted by means of the screw dwhich is threaded in the jaw and is actuated by the large hand wheel 0ZThe screw 03 is held against longitudinal movement by the hub of thehand wheel 0Z and the flange or shoulder 03 on the screw.

E is a gage which may be set at any distance from the saw A, by clampingat any point along the rod 6, Fig. 2 and Fig. 3. Of course the gage Eand rod e, may be swung through the requisite angle to bring the gage inline with the work when it is positioned in the vice jaws.

The carriage C, is actuated by the relative movement between the feednut, c and the feed screw, f. f extends through the hollow clampingscrew 6F; and has the handwheel 7" attached to it. The nut, 0 isactuated through the spur gears g 9 from the shaft G, which is itselfactuated from the pulley shaft 12, through the worm, 9 the worm wheel, 9and a disconnecting device between said worm wheel and shaft. This trainof gearing feeds the saw into the work. The nut, 0 is rotated in theopposite direction and at a higher speed, to retract the saw, thismovement being obtained through the spur gears h 72, and the bevel gearsit h This movement constitutes the quick return.

Both the feed and quick return of the saw are caused by the nut crotating on the screw f. This screw is not positively held againstrotation with the nut 0 but is only frictionally held. The hub of thecrank handle f bears against the outer end of the hollow clamping screw0F, and the inner end of this screw d is recessed as shown at d. Withinthis recess and bearing between the fiber washer against the face on (iand the washer f on the screw f, is the short spiral spring f More orless tension can be put on the spring f by adjusting the crank handle, ftoward or away from the washer In practice, sufficient tension is put onf to hold 7' stationary during ordinary feeding, but allowing 7 toreadily turn with the nut, and thus stop the feed or quick return, whenthe nut 0 reaches the end of its travel in either direction. The nut isprovided with a projection or lug at each of its ends, 1" r, Fig. 1, andthese lugs engage the pin, f at the end of the feed screw, or the pin,7" in the washer, f according to which end of its Patented Oct. 19,1909.-

travel the carriage has reached, When these lugs and pins engage, thescrew and nut travel together, and all travel of the carriage ceases. Bythis means, the movement of the carriage is automatically stopped, whilethe machine as a whole continues in movement. This feature obviates thenecessity of con stant attendance. A very important advantage of thisfrictional holding of the feed screw lies in the fact that while thefeed is thrown in, the saw may be rapidly moved backward or forward byhand, by turning the hand wheel, f without stopping to throw the clutch,9 out and in again.

As the feed nut, c is positively driven by the spur gears, g and g afull description of how motion is given to shaft, G, will clearly showhow 0 is actuated. Loosely splined on shaft, 6, is the collar, 9carrying the lug, g? at one end, and the lug, g at the other. Collar, gis actuated along the shaft, 6, by the compound lever, g 9 On the worm,g is the lug, 9 for engagement by the lug, g and on the spur gear, h,the lug, h is provided for engagement with the lug, g. The worm, g andspur gear, h, are idle on shaft 6, until either one or the other isengaged by the collar, and thus driven by the shaft. The movement givento the carriage on the quick return is a comparatively quick one, and toaccommodate the heavy strain of starting, the lug, k is on a hub, loosefrom the periphery of gear, h, and connected thereto by the heavyspring, ]L5.

The feed movement is conveyed from the worm, 9 to the worm wheel, 9 Thiswheel is without any hub, and the web, is, of the wheel, frictionallyengages two flanges, and 76 through rings of vulcanized fiber. Thefriction between these faces is adjusted to the amount necessary tocarry the feed, by the nut and spring, 70 7s acting on the slidingflange, 70 This friction device automatically adjusts the feed. The feedas given by the machine is constant and is rapid, as for a light load.

When the thickness of the material being out is greater, more teeth ofthe saw will be engaged, and therefore the load on the saw will beincreased. As soon as the load reaches the limit that can be pulled bythe friction, the friction slips momentarily, thus reducing the feed forthe heavier load. This same automatic adjusting action sometimes takesplace between the feed screw and nut 0 The shaft, G has the disk atshrunk thereon, so that the shaft and disk are practically integral. Thesleeve and flange on the left hand end of shaft Gr, carries what mightbe termed a crown wheel ratchet, the teeth of which are marked, 25 t t.The disk, on has a groove, m milled in it, and in this groove is pivotedthe pawl, 39, on the pin, 39 p is a tooth on the end of pawl, 27, thesame width as the ratchet teeth, It. The plunger, p pressed outward bythe spring, 7)", throws the pawl, 72 into engagement with the ratchetteeth on sleeve 70 and as the worm wheel, 9 and ratchet sleeve, 72 aredriven to the left to feed,see arrow in Fig. 6,-the disk m and shaft, G,are carried along with the ratchet sleeve, 72

The pawl, p, has a lug, p projecting laterally therefrom, through theslot, 127/, in the disk, m. 72 engages in a hole in the bevel gear, h ofthe quick return train, said bevel gear, 71, being loosely mounted onthe shaft G and only coupled therewith by means of the pawl, 22 and thedisk, m. hen the quick return train is in operation, the gear, [L3 isdriven to the right, that is, in the opposite direction to the arrow inFig. 6. In its initial movement to the right, 71 carries the pin or lug,p of the pawl, 19, inwardly, thus compressing the spring, 1), andwithdrawing the pawltooth, 79 from the teeth, t t, of the ratchetsleeve, 7: \Vhile the quick return train is in gear, the worm, and Wormwheel, 9 and ratchet, 72 all remain stationary while the shaft, G,rotates to the right. While the feed train is in gear, the bevel gear,72, and all the quick return train, including it, is slowly driven withthe shaft G to the left, that is, in the reverse direction.

The saw, A,see Figs. 9, 10 and l1,-has its teeth chamfered on alternatesides, see a. By this device, the saw blade is much thicker than thecutting edge is wide, which makes the saw stiff under a heavy feed. Thechief advantage of this feature, however, lies in the fact that thechips are much narrower than the saw kerf, and have plenty of room toexpand and curl as they will, without clogging the saw kerf. In severingthe chips, considerable heat is developed, most of which appears to beabsorbed by the chips, and as the chips curve they actpractically likeshort cylinders of solid metal. Now if these cylinders fill the saw kerfand expand endwise, it is clear that about one heavy chip would clog themachine. Without this, or some equivalent feature in the saw, a machineof this kind becomes entirely impractical, as its feed is too slow.

What I claim as my invention is,

1. In a metal sawing machine, a frame, av carriage thereon, a normallystationary feed screw mounted 011 the frame, a feed nut rotatable in thecarriage, means for rotating said nut, and means whereby the feed screwis rotated with the nut when the saw has reached the limit of its travelin either direction.

2. In a metal sawing machine, a saw arbor, a feed shaft therefor, ashaft to which power is applied, speed reducing spur gearing betweensaid power shaft and the saw arbor, a worm on said power shaft, a wormwheel engaging said worm, said worm wheel having a web engaging betweenfriction flanges to the feed shaft, disengageable means connecting thefriction flanges to the feed shaft, a quick return gearing for drivingthe feed shaft in the opposite direction, and means for causing saidquick return gearing to automatically disengage said connecting means.

3. In a metal sawing machine, a screw and I friction train of gearingfor feeding, a spur and bevel train of gearing for the quick return, apawl pivoted on the feed shaft, and automatically engaging the frictiongearing while feeding, a l-ug on said pawl engaging an element of thequick return, whereby the pawl is automatically disengaged from thefriction gearing when the return train is thrown in operation.

4. A metal sawing machine, comprising a frame, a carriage mountedthereon, a suitably driven saw carried by the carriage, a feed screwrotatably mounted on the frame, a spring pressed washer frictionallyheld against the feed screw to normally prevent the rotation thereof, anut on the carriage threaded on the feed screw, means for turning thenut, and means for locking the nut with the washer so that the feedscrew turns with the =-nut to step further feed of the carriage.

5. A metal sawing machine, comprising a frame, a carriage mountedthereon, a suitably driven saw carried by the carriage, a feed screwrotatably mounted on the frame, a spring pressed washer frictionallyheld against the feed screw to normally prevent the rotation thereof, anut on the carriage threaded on the feed screw, means forturning thenut, means for locking the nut with the washer so that the feed screwturns with the nut to stop further feed of the carriage, and means forlocking the nut with the feed screw when the nut is at the other end ofits movement on the feed screw.

6. A metal sawing machine, comprising a frame, a carriage mountedthereon, a saw carried by the carriage, a drive shaft, a worm looselymounted on the drive shaft, a screw and nut feed connection between thecarriage and the frame, a feed shaft geared to the said feed connection,a worm wheel on the feed shaft frictionally held against rotationindependent thereof and meshing with the worm, a quick return feedgearing between the drive shaft and the feed shaft, a clutch on thedrive shaft for engaging either the worm or the quick return gearing,and a ratchet connection between the quick return gearing and the feedshaft.

7. A metal sawing machine, comprising a frame, a carriage mountedthereon, a saw carried by the carriage, a drive shaft, a worm looselymounted on the drive shaft, a

screw andnut feed connection between the carriage and the frame, a feedshaft geared to the said feed connection, a flange on the feed shaft, aspring pressed flange loosely mounted on the feed shaft, aworm wheelfrictionally held between the said flanges and meshing with the worm, aquick return feed gearing between the drive shaft and the feed shaft, aclutch on the drive shaft for engaging either the worm or the quickreturn feed gearing, and a ratchet connection between the quick returnfeed gearing and the feed shaft.

8. A metal sawing machine, comprising a frame, a carriage mountedthereon, a saw carried 'by the carriage, a drive shaft, a worm looselymounted on the drive shaft, a screw and nut feed connection between thecarriage and the frame, a feed shaft geared to said feed connection, afixed flange on the feed shaft, a spring pressed flange loosely mountedon the feed shaft, a worm wheel frictionally held between the twoflanges and meshing with the worm, a quick return feed gearing betweenthe drive shaft and the feed shaft, a clutch on the drive shaft forengaging either the worm or the quick return feed gearing, the quickreturn feed gearing terminating in a pinion loose on the feed shaft, adisk fixed on the feed shaft, teeth on the fixed flange of the feedshaft, a spring pressed pawl pivoted to the disk and adapted to engagesaid teeth, and a connection between the pawl and the pinion, wherebythe reverse movement of the pinion when I; the clutch engages the quickreturn feed gearing causes the pawl to disengage the teeth of theflange, said pawl constituting a connecting means between the quickreturn feed gearing and the feed shaft.

9. A metal sawing machine, comprising a frame, a carriage mountedthereon, a saw carried by the carriage, a drive shaft, a screw and nutfeed connection between the carriage and the frame, a clutch on thedrive shaft, a feed shaft geared to the said feed connection, a feedgearing connected with the feed shaft and adapted to be engaged by theclutch, and a quick return feed gearing connected to the feed shaft, oneof the gears of said quick return feed gearing having a loose springconnected hub also adapted to be engaged by the clutch.

10. A metal sawing machine, comprising a frame, a carriage mountedthereon, a saw carried by the carriage, a screw and nut feed connectionbetween the carriage and the frame, a feed shaft geared to the screw andnut feed connection, a drive shaft, a clutch thereon, a worm on thedrive shaft adapted to be engaged by the clutch, a worm wheel meshingwith the worm, a pawl and ratchet connection between the worm wheel andthe drive shaft, a quick return feed gearing also adapted to be engagedby the clutch and having connection with the feed shaft by name to thisspecification in the presence of means of the pawl, whereby the reverseopertwo witnesses. ation of the nick return feed earin causes the pawlto disengage the rziftchet and be- PAUL P081" ,5 come the operativeconnection for the quick i/Vitnesses:

return feed gearing. 'E. B. SYMo s,

In testimony whereof, I have signed my J. E. HUTOHINSON.

